Comedy Central has ordered up to 508 Porta-potties for its rally this Saturday on the National Mall to be led by hosts Jon Stewart and Stephen Colbert.

That number suggests organizers expect a crowd of 150,000 people, The Wall Street Journal reported online yesterday.

In securing the portable restrooms, Comedy Central has resolved one of the major logistical issues for the event, which has yet to be approved by the National Park Service.

The toilets will be coming from United Site Services, a Waldorf, Md., company that said it was providing 450 stand-alone lavatories, 50 units for handicapped users and one restroom trailer with at least eight stalls.

Event organizers usually figure 1 toilet for every 300 attendees.

A National Park Service spokesman said the service would likely announce a decision on Comedy Central’s permit application by Wednesday.